We have made it to NX8.5 I have a need to make a bell coil spring that should be able to be modeled into a deformable part by just changing one length expression. How would I be able to go about doing this. I have attached a spring we did in NX7.5. Which does not have have and of these expressions.
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Bell Coil springs NX8.5 1
- Thread starter SDETERS
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JohnRBaker
Mechanical
You mean something like the attached?
John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Digital Factory
Cypress, CA
Siemens PLM:
UG/NX Museum:
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John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Digital Factory
Cypress, CA
Siemens PLM:
UG/NX Museum:
To an Engineer, the glass is twice as big as it needs to be.
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- #3
Yes John Thanks. But I need to understand these law curves a little bit better I guess. There is a percentage number for arc length typed in the helix command for cubic along spline. Is there a way that someone could explain what is going on with this selection? Is there anyway that I could control where the bell coils start and stop and control the actual pitch of the spring. I am wanting this spring to have certain number of coils, different pitch rates at the ends and be able to match the spring data I have on the print.
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1
- #4
There are several "law type" options, John chose "cubic along spine"; for this option you will need a separate curve that represents the length of your helix. You will find two lines in the XY plane next to the spring, one is for the diameter law, the other for the pitch law. The length of these spine curves do not have to match the length of your helix, but what happens along the spine will be reflected in your helix. Let's look at the diameter law: point 1 is located at 0% on the spine and the value is 130mm. Point 2 is at 28% and the value is 100mm. Point 3 is at 100% and the value is 100mm. This means that the helix will start at 130mm diameter, transition down to 100mm at 28% along the helix (cubic interpolation is used for a smooth transition), and it will stay at 100mm until the end of the helix.
Similarly, the pitch transitions from 10mm to 20mm at 25% along the helix, stays constant until 89% along the helix, then transitions back down to 10mm at the end of the helix.
www.nxjournaling.com
Similarly, the pitch transitions from 10mm to 20mm at 25% along the helix, stays constant until 89% along the helix, then transitions back down to 10mm at the end of the helix.
www.nxjournaling.com
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